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Ed;
You could try to reduce the input voltage to the power transformer, I have tried this on one set, via a Variac, because the field coil on the speaker was running a bit warm, did not seem to help much, though changing the cathode bias resistor on the 6F6 tube did help. I reduced the line voltage from 120 all the way down to 110, did not make a difference.
Regards
Arran
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RE: Zenith 12H090 - by Arran - 01-13-2021, 12:31 AM
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